PDF malware analysis — malicious · fc23b731387ba007

MALICIOUS

PDF

12.5 KB

MD5: 272d4636b51cb26cd985c9a938e6b147 SHA-1: c974a239cf8867ab5ded8254914903801ef0656e SHA-256: fc23b731387ba0070d248e631dc1fbe786ee52858bae2b5846681941e02b65d0

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute arbitrary code. The deobfuscated JavaScript streams, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, likely download and execute a secondary payload, indicating a multi-stage attack. The specific payload and final objective are not discernible from the provided evidence.

Heuristics 4

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `323b9af55fd339099eefe6bb372f3d831cf2b5456e71a17890c3b6d7fd7126b0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `74550940d6585018b57c4e93a1b22aae9a392bf84bbfcabc3e35e826f0218049`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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